???????????? ?????????? ????????????? ?????????????????????????????????? ???????? ???????? ?? ??????? ????? ?????????? ???????????   ???????? ????????? ??????????????????????????????????????????? ???????? ???????????? ??????????? ?? ????????????? ????????????????????????????????????????????????????????????????????????????????? ??????????????

By default, pg_upgrade will watch for all files on the upgraded cluster being written properly to disk. this feature brings about pg_upgrade to return without waiting around, which is faster, but implies that a subsequent running program crash can go away the data directory corrupt. usually, this option is helpful for tests but really should not be